@@ -10,6 +10,9 @@
*/
#undef HAVE_AS_CFI_SECTIONS
+/* Define to 1 if the assembler supports LSE. */
+#undef HAVE_AS_LSE
+
/* Define to 1 if the target assembler supports thread-local storage. */
#undef HAVE_CC_TLS
@@ -48,8 +48,14 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
* separately to minimize code size.
*/
+#include "auto-target.h"
+
/* Tell the assembler to accept LSE instructions. */
+#ifdef HAVE_AS_LSE
.arch armv8-a+lse
+#else
+ .arch armv8-a
+#endif
/* Declare the symbol gating the LSE implementations. */
.hidden __aarch64_have_lse_atomics
@@ -58,12 +64,19 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#if SIZE == 1
# define S b
# define UXT uxtb
+# define B 0x00000000
#elif SIZE == 2
# define S h
# define UXT uxth
+# define B 0x40000000
#elif SIZE == 4 || SIZE == 8 || SIZE == 16
# define S
# define UXT mov
+# if SIZE == 4
+# define B 0x80000000
+# elif SIZE == 8
+# define B 0xc0000000
+# endif
#else
# error
#endif
@@ -72,18 +85,26 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
# define SUFF _relax
# define A
# define L
+# define M 0x000000
+# define N 0x000000
#elif MODEL == 2
# define SUFF _acq
# define A a
# define L
+# define M 0x400000
+# define N 0x800000
#elif MODEL == 3
# define SUFF _rel
# define A
# define L l
+# define M 0x008000
+# define N 0x400000
#elif MODEL == 4
# define SUFF _acq_rel
# define A a
# define L l
+# define M 0x408000
+# define N 0xc00000
#else
# error
#endif
@@ -144,9 +165,13 @@ STARTFN NAME(cas)
JUMP_IF_NOT_LSE 8f
#if SIZE < 16
-#define CAS glue4(cas, A, L, S)
+#ifdef HAVE_AS_LSE
+# define CAS glue4(cas, A, L, S) s(0), s(1), [x2]
+#else
+# define CAS .inst 0x08a07c41 + B + M
+#endif
- CAS s(0), s(1), [x2]
+ CAS /* s(0), s(1), [x2] */
ret
8: UXT s(tmp0), s(0)
@@ -160,9 +185,13 @@ STARTFN NAME(cas)
#else
#define LDXP glue3(ld, A, xp)
#define STXP glue3(st, L, xp)
-#define CASP glue3(casp, A, L)
+#ifdef HAVE_AS_LSE
+# define CASP glue3(casp, A, L) x0, x1, x2, x3, [x4]
+#else
+# define CASP .inst 0x48207c82 + M
+#endif
- CASP x0, x1, x2, x3, [x4]
+ CASP /* x0, x1, x2, x3, [x4] */
ret
8: mov x(tmp0), x0
@@ -181,12 +210,16 @@ ENDFN NAME(cas)
#endif
#ifdef L_swp
-#define SWP glue4(swp, A, L, S)
+#ifdef HAVE_AS_LSE
+# define SWP glue4(swp, A, L, S) s(0), s(0), [x1]
+#else
+# define SWP .inst 0x38208020 + B + N
+#endif
STARTFN NAME(swp)
JUMP_IF_NOT_LSE 8f
- SWP s(0), s(0), [x1]
+ SWP /* s(0), s(0), [x1] */
ret
8: mov s(tmp0), s(0)
@@ -204,24 +237,32 @@ ENDFN NAME(swp)
#ifdef L_ldadd
#define LDNM ldadd
#define OP add
+#define OPN 0x0000
#elif defined(L_ldclr)
#define LDNM ldclr
#define OP bic
+#define OPN 0x1000
#elif defined(L_ldeor)
#define LDNM ldeor
#define OP eor
+#define OPN 0x2000
#elif defined(L_ldset)
#define LDNM ldset
#define OP orr
+#define OPN 0x3000
#else
#error
#endif
-#define LDOP glue4(LDNM, A, L, S)
+#ifdef HAVE_AS_LSE
+# define LDOP glue4(LDNM, A, L, S) s(0), s(0), [x1]
+#else
+# define LDOP .inst 0x38200020 + OPN + B + N
+#endif
STARTFN NAME(LDNM)
JUMP_IF_NOT_LSE 8f
- LDOP s(0), s(0), [x1]
+ LDOP /* s(0), s(0), [x1] */
ret
8: mov s(tmp0), s(0)
@@ -5484,6 +5484,46 @@ $as_echo "#define HAVE_AS_AVX 1" >>confdefs.h
;;
esac
+
+
+case "${target}" in
+aarch64*-*-*)
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking if the assembler supports LSE" >&5
+$as_echo_n "checking if the assembler supports LSE... " >&6; }
+if ${libgcc_cv_as_lse+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+ asm(".arch armv8-a+lse\n\tcas w0, w1, [x2]");
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ libgcc_cv_as_lse=yes
+else
+ libgcc_cv_as_lse=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_as_lse" >&5
+$as_echo "$libgcc_cv_as_lse" >&6; }
+ if test x$libgcc_cv_as_lse = xyes; then
+
+$as_echo "#define HAVE_AS_LSE 1" >>confdefs.h
+
+ fi
+ ;;
+esac
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for init priority support" >&5
$as_echo_n "checking for init priority support... " >&6; }
if ${libgcc_cv_init_priority+:} false; then :
@@ -564,6 +564,25 @@ i[[34567]]86-*-* | x86_64-*-*)
esac])
LIBGCC_CHECK_AS_AVX
+dnl Check if as supports LSE instructions.
+AC_DEFUN([LIBGCC_CHECK_AS_LSE], [
+case "${target}" in
+aarch64*-*-*)
+ AC_CACHE_CHECK([if the assembler supports LSE], libgcc_cv_as_lse, [
+ AC_TRY_COMPILE([],
+changequote(,)dnl
+ asm(".arch armv8-a+lse\n\tcas w0, w1, [x2]");
+changequote([,])dnl
+ ,
+ [libgcc_cv_as_lse=yes], [libgcc_cv_as_lse=no])
+ ])
+ if test x$libgcc_cv_as_lse = xyes; then
+ AC_DEFINE(HAVE_AS_LSE, 1, [Define to 1 if the assembler supports LSE.])
+ fi
+ ;;
+esac])
+LIBGCC_CHECK_AS_LSE
+
dnl Check if as supports RTM instructions.
AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,